netdev - Re: [PATCH 14/14] SIWv2: Documentation: siw.txt

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Date:	Sat, 18 Jun 2011 19:56:24 +0200
From:	Bart Van Assche <bvanassche@....org>
To:	Bernard Metzler <bmt@...ich.ibm.com>
Cc:	netdev@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [PATCH 14/14] SIWv2: Documentation: siw.txt

On Thu, Jun 16, 2011 at 2:42 PM, Bernard Metzler <bmt@...ich.ibm.com> wrote:
> ---
>  Documentation/networking/siw.txt |  156 ++++++++++++++++++++++++++++++++++++++
>  1 files changed, 156 insertions(+), 0 deletions(-)
>  create mode 100644 Documentation/networking/siw.txt
>
> diff --git a/Documentation/networking/siw.txt b/Documentation/networking/siw.txt
> new file mode 100644
> index 0000000..805e21b
> --- /dev/null
> +++ b/Documentation/networking/siw.txt
> @@ -0,0 +1,156 @@
> +SoftiWARP: Software iWARP kernel driver module.
> +
> +General
> +-------
> +SoftiWARP (siw) implements the iWARP protocol suite (MPA/DDP/RDMAP,
> +IETF-RFC 5044/5041/5040) completely in software as a Linux kernel module.
> +siw runs on top of TCP kernel sockets and exports the Linux kernel ibverbs
> +RDMA interface. siw interfaces with the iwcm connection manager.
> +
> +
> +Transmit Path
> +-------------
> +If a send queue (SQ) work queue element gets posted, siw tries to send
> +it directly out of the application context. If the SQ was non-empty,
> +SQ processing is done asynchronously by a kernel worker thread. This
> +thread gets scheduled if the TCP socket signals new write space to
> +be available. If during send operation the socket send space becomes
> +exhausted, SQ processing is abandoned until new socket write space
> +becomes available.

It seems like some information is missing in the above:
- That the siw kernel module creates an iWARP device for each Ethernet
interface found but not for other network interfaces that support the
family of IP protocols.
- Whether or not such an iWARP device is created for Ethernet
interfaces instantiated after the siw kernel module has been loaded.

Bart.
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